Looking to upgrade graphics card

I have a Pegatron M2N78-LA (Violet) motherboard, and for a time now I could never figure out whether it had PCI express 1.0 or 2.0 slot. I still don't have a solid answer which is why I am here. I do game a fair bit and I would like a very solid and dependable upgrade.

Have you upgraded the pw supply? Big box systems ie dell, hp, whatever ship with a pw supply that is just enough to power the system as shipped. There is little or no reserver for power hungry upgrades ie real video card.

I checked and cannot find if it is pci-1 1.0 or 2.0. I do not build with nvidia chipset boards so I do not have a lot of knowledge regarding nvidia chipsets.